Flushing apparatus



Jan 6, 1931. c. R. LE GRICE 1,787,436

FLUSHING APPARAIUS Filed Dec. 27, 1929 Patented Jan. 6, 1931 cmrroxn REGINALD LE GRICE, or 1\TEW LYZNN, AUCKLAND, 1\TEW ZEALAND FLUSHING APIBATUS pplication filed December 27, 1929, Serial No. 416,957, ans! in New Zealand Marh 18, 1929.

This invention relates to fiushing valves for the purpose of delivering a desired quantit3 oylinder attached to a tank or cistern and having openings for water to fiow from the oistern into the oylinder, the openings below the piston being considerably groater than the opening above the piston. A piston is slideabie in the cyiinder and carries a valve :or ciosing an outietirom the oylinder into the flushing pipe. A channel or by-pass of greator area th an the area of the opening into the space above the piston, leads i:rom the oylinder at a position above the piston and passes through a relez sing vaive located on .the exterior of the cistrn and thence into the fiushing pipe at a position below the valve.

The rlease valve normally closes the by-passaid of the accompanying drawings, where- 1n: Figure 1, is a view showing the device in a flushing tank.

Figure 2, is a cross section through thedevice showing the valve in its normal closed position. v

Figure 3, is a cross section throngh the deVice showing the valve in its open position with the piston in cross section.

area of this bypass being greaterrthan that 'of the aperture 12. 'F1om the b-pass 13 Figure4, is a cross ,sectional plan on line AA Figure 3. 7

Figure 5, is a cross section through the release valve.

R erringto the drawings, the device is there shown with its cylinder l attachedto the bottom of a tank 2 by being threaded therein and secured by a nut 3 (see Figure 1),

this tank being closed and having an,inlet pipe 5from a source of supply at a higher level so that the required pressure is given within the tank, as for exanflple this inlet may be direct froni a high pressure water suppl. The cylinder wall has openings4 -to enable the water from the tank to fiow therein, While a'valve seating- 6' xtends around an outlet 7 in the bottona of the cylinder: A piston 8{is slideabl in the eylinder and 'carries' avalve 9"by means of its stem 10 which is guided in a cover of the cylinder freeiyenough to permit air to slowly leak into or out of-the Cylindez past the stem. The valve is adapted to seatupon the seating 6, thereby closing the outlet 7 from thecylinder 1int0 the part 11 from WhiCh leads the flush ing pipe 24. The area of the outlet 7 is *greater than that of the inlet 5 so that the tank rnxempty by means ofsu,eh outIet whileth'e water Still ehteringby the inlet. Anaperture l2above the normal'pbsition of thepiston en'ables water in the tank to pass into the space above the pistonso asto estab lish equiIibriin' onlo0th sides thereof, while a bpaSs 13 leads froin this space downwards in the Wall of the deviCe, the erosssectional Which lads0ntside the tank, a pipe 14 leads to 2. passage 15 in a release valve casi'ng 16, (see Figure 5), andhaving a valve seating 17 fromWhich leads a passage 18 to which is comiected another pipe 19 o arried into the flushingpipe 24:;ts shown in Figure 1. A Valve 20 havin'g'a fstem 21,is hormally re tained'on its seat by a spring 22 in compressioirbetween the neck of the casing and a bntton 23 thereby' closing the passage 15 from 'the'passage 18". This release valve may be attatched in;any oonvenient position, either w close to the tank'2 or a considerable distance from it, the drawing (Figure 1) showing it attached to the flushing pipe by means of a band 26.

The tank 2 Will fill from the pipe 5 until the air therein is compressed to the pressure according to that of the head of water supplyingthe tank by the pipe 5, filling the cylinder on each side of the piston by fiowing through the openings 4 and the aperture 12, air from above the cylinder leaking past the valve stem," and asthe pressure 'inore'ase the valves 8 and 20 Will be tightened on their seatings thus preventing exit of waterfrom the tank. e

T,o operate the device for flushing purposes, the button 23 of the release valve is pushed causing the valve 20 toopen, thus making communication betvveen the space above the piston and the interior of the flushing pipe 11 and permitting'water in the said space to flow through the -bypass, and since the by-pa-ss'is greater in area than the aperture 12, the pressure above the piston is released. Immediately th1s occurs, the water oeneath the piston having greater pressure thereon than upon the surface of the Valve owing to the greater area of the piston, Will raise the piston thereloy shutting ofi' urther entrance of water through the aperture 12. The water inthe tank now passes through the opening 7, being enabled;to pass out by theexpansion of the air compressed within the tank, the fiow continuing until pressureof the water no longer overcomes the we1ght of the valve and piston. Thewater level, being noxv below the top of the cylinder, air Will leak into the space abovethe piston, past the stem 10, permitting the valve to fallslow ly and to close silently upon its seatingQ The outlet 7 being closed, the tank Will againfill above explained, r

" Vhat I olaim is v r 1. A fiushmg apparatus compr1smg a closed c1stern, acylmder extendmg 1nto the oral opening, a flushing pipe leading down. wardly upon the cylinder, a valve seat benormally closing theseat, a piston 'freely slidable in the cylinder and of greater area than the valve, sardeylmder hav1ng openings there1n below the piston, sa1d cyhnder release valve normally closing the by-pass, and adapted when open to permit mater to fiow from the eylinder above the piston into the flushing pipe, as and for the purpose set forth.

2. A flushing apparatus comprising adstern, a cylinder extending into the cistern, a

piston Sliclable in the cylinder,said cylinder upon oppositeusides of the latter valve as and for the purpose set forth.

In testimony whereof, I have signed my name to this specificationQ CLFFORD REGlNALD LE GRIE.

eistern, acover forthe clinder havinga cen .tween the cylinder and flushing pipe, a valve having an aperture inits wall above the pisv ton adapted to be closed .by-the piston when the same rises in thecylihderg said aperture 'being of less'area than the opei1ings, the cylinder having a by-pass in its wall and opening at one end above the piston and disenargin at a point below the valve seat, the area of theby-pasS being of greater eapaeitythanthe area 01" the aperture, a ste1n conneet1ng the -valve and P1SlZOII and pro ect1ng from the L valve, said stem being guided in the opening of the cover and :Ereelv fitti ng in said opening whereby ain mav leal: past ;saidst em, and a a by-pass in its 

